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Studio Melipone’s Docker container for Ruby 2.1.0

The container is based on phusion/baseimage-docker and has ruby 2.1.0 installed. It is intended for local development.

Services installed and running:

  • Postgresql 9.1
  • Redis
  • Memcache

How it works

You rails application needs to be mounted to /rails_app or the container won’t work properly. You’ll need to have a docker directory at the root of your project. Inside this directory, create a bundle directory and a run.sh script. Write any commands needed to boot your app in the run.sh script and know that the following commands are executed automatically before invoking the run.sh script:

  • bundle install
  • rake db:create
  • rake db:migrate

How to use

Just run the container like this (example with our Tadaam app):

$ docker run -t -i -v ~/Coding/tadam:/rails_app -p 3000:3000 -p 3001:3001 studiomelipone/ruby:2.1

This will automatically boot our Rails app and forward ports 3000 and 3001 to the host.

Persistant DB

It is possible to keep the DB between runs, just mount a directory that Postgresql will use at /var/lib/postgresql. Example:

$ docker run -t -i -v ~/Coding/tadam:/rails_app -v ~/Coding/tadam/docker/postgresql:/var/lib/postgresql -p 3000:3000 -p 3001:3001 studiomelipone/ruby:2.1

Don’t worry about an empty directory on the first run, the container will create a new PG database for you.

Accessing the DB

A role for root is created automatically and has all the permissions on the DB. So a typical database.yml could look like this:

development:
  adapter: postgresql
  encoding: unicode
  database: tadaam_development
  pool: 5
  username: root

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Docker build for ruby 2.1.0

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